Gurobi 5.0.1 (linux64) logging started Fri Jan 18 05:28:52 2013

Optimize a model with 10140 rows, 11020 columns and 42010 nonzeros
Presolve removed 30 rows and 20 columns
Presolve time: 0.26s
Presolved: 10110 rows, 11000 columns, 31980 nonzeros
Variable types: 6010 continuous, 4990 integer (4990 binary)

Root relaxation: objective 1.997658e+04, 3853 iterations, 0.13 seconds

    Nodes    |    Current Node    |     Objective Bounds      |     Work
 Expl Unexpl |  Obj  Depth IntInf | Incumbent    BestBd   Gap | It/Node Time

     0     0 19976.5790    0    2          - 19976.5790     -      -    0s
     0     0 20063.0045    0    4          - 20063.0045     -      -    0s
     0     0 20096.6561    0    4          - 20096.6561     -      -    0s
     0     0 20106.0419    0    4          - 20106.0419     -      -    0s
H    0     0                    20907.269800 20106.0419  3.83%     -    1s
     0     2 20106.4326    0    4 20907.2698 20106.4326  3.83%     -    1s
H   54    54                    20178.000595 20107.2816  0.35%   1.2    2s
   270   260 20145.4956  100    2 20178.0006 20120.3156  0.29%   2.4    5s
H  324   214                    20158.640457 20120.3156  0.19%   2.5    5s
   946   394 20152.6865  215    1 20158.6405 20141.0299  0.09%   6.8   10s
  5498  2110 20145.3147   44    2 20158.6405 20145.2418  0.07%  13.0   15s
* 6905  1793             100    20158.472446 20148.4654  0.05%  17.4   17s
* 6963  1735             101    20158.452861 20148.6912  0.05%  17.6   17s
  8602   434     cutoff  140      20158.4529 20154.2287  0.02%  17.1   20s

Cutting planes:
  Gomory: 4
  Flow cover: 4

Explored 9169 nodes (152910 simplex iterations) in 21.02 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 2.015845286066e+04, best bound 2.015644398538e+04, gap 0.0100%